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Summit Lights Dimming

so after putting a Mamba Monster on my truck with the RC-Lights 911 police light kit. when i turn the truck the lights built in to the truck dim (not the RC-Lights i installed) everything is stock other then the ESC and Motor. i also have a capacitor plugged in to my RX local hobby store say i needed it being i was running all the light but don't seem to do much of anything. I was wondering if i would have to get an external BEC or something to fix this lil issue

They only dim when you turn, not when you accelerate or anything? If so it just means that the BEC isn't quite strong enough to power everything it is. An external BEC will certainly take care of this, and you will notice better all around performance from your servos and anything else you have hooked up. That cap is only good for preventing brownouts from momentary high power surges, it doesn't provide "extra" power or anything the way an external BEC would. Check out the 10A Castle BEC, it's proven to be more than sufficient.

Also check your steering servos
They have been known to cause that when one is gone or is having issues.
Unplug them try one at a time to see if the issue continues.That will eliminate the servos if nothing else,plus doesn't cost anything to check

That's what I was thinking so I can just take the cap off and go with the BEC right? And this is a new truck only a week old. hate to think one of the servo could be bad. I know that don't matter but it could still be going bad. But I will try that as well.

ok guys i have tried unplugging the servos and with none of them plugged in the lights didn't dim and with one plugged in still dimmed didn't matter what one i had plugged in im thinking its a power thing and that im going to need the external BEC im also going to be having a motor cooling fan on there so i really thing the BEC will be a good move what do you guys think

When you tested your servos, did you also unhook the linkages? The strain of turing the wheels and an unplugged servo (thats just along for the ride) could cause similar issues, as you are really working the single servo.